scholarly journals Three-Dimensional Hierarchical Porous Carbons Derived from Betelnut Shells for Supercapacitor Electrodes

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7793
Author(s):  
Arjunan Ariharan ◽  
Sung-Kon Kim
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Current Density ◽  
Porous Carbon ◽  
Three Dimensional ◽  
Energy Storage Materials ◽  
Hierarchical Porous Carbon ◽  
Hierarchical Porous ◽  
A Current ◽  
Charge Discharge

Electrochemical energy storage (EES) systems are attracting research attention as an alternative to fossil fuels. Advances in the design and composition of energy storage materials are particularly significant. Biomass waste-derived porous carbons are particularly suitable for use in EES systems as they are capable of tuning pore networks from hierarchical porous structures with high specific surface areas. These materials are also more sustainable and environmentally friendly and less toxic and corrosive than other energy storage materials. In this study, we report the creation of a three-dimensional hierarchical porous carbon material derived from betelnut shells. The synthesized three-dimensional (3D) hierarchical porous carbon electrode showed a specific capacitance of 290 F g−1 using 1 M KOH as an electrolyte at a current density of 1 A g−1 in three-electrode systems. Moreover, it offered a high charge/discharge stability of 94% over 5000 charge–discharge cycles at a current density of 5 A g−1. Two-electrode symmetric systems show a specific capacitance of 148 F g−1, good cyclic stability of 90. 8% for 5000 charge-discharge cycles, and high energy density of 41 Wh Kg−1 at the power density of 483 W Kg−1 in aqueous electrolyte.

scholarly journals High performance hierarchical porous carbon derived from distinctive plant tissue for supercapacitor

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jinxiao Li ◽  
Yang Gao ◽  
Kuihua Han ◽  
Jianhui Qi ◽  
Ming Li ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
Porous Carbon ◽  
High Performance ◽  
Initial Structure ◽  
Equivalent Series Resistance ◽  
Hierarchical Porous Carbon ◽  
Plant Materials ◽  
Hierarchical Porous ◽  
Electrical Double Layer Capacitance

AbstractIt is generally acknowledged that the activation method and component of the precursor are of great importance for making porous carbon. In this study, four plant materials belong to one genus were selected as optimized plant material to produce hierarchical porous carbon for supercapacitors, the influence of initial structure was discussed. All the produced porous carbons have large specific surface area (higher than 2342 m2 g−1), high microporosity (more than 57%), and high pore volume (larger than 1.32 cm3 g−1). All the samples show characteristic of electrical double layer capacitance, and the onion-based porous carbon obtain highest specific capacitance of 568 F g−1 at the current density of 0.1 A g−1. With the current density rising from 1 A g−1 to 50 A g−1, the specific capacitance only decreases for 20%. After 5000 cycles, all the samples show relatively high capacitance retention (up to 97%). Two-step acid pickling has washed most impurities and directly lead to small equivalent series resistance (lower than 0.2 Ω). The samples show high power density and energy density (71 W h kg−1@180 W kg−1, 210 kW kg−1@33 W h kg−1). This study open an avenue to create high-performance hierarchical porous carbon based on plant architecture.

scholarly journals Liquid Phase Synthesis of CoP Nanoparticles with High Electrical Conductivity for Advanced Energy Storage

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Guo-Qun Zhang ◽  
Bo Li ◽  
Mao-Cheng Liu ◽  
Shang-Ke Yuan ◽  
Leng-Yuan Niu
Keyword(s):  
Electrical Conductivity ◽  
Energy Storage ◽  
Liquid Phase ◽  
Specific Capacitance ◽  
Current Density ◽  
High Surface ◽  
High Surface Area ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Materials

Transition metal phosphide alloys possess the metalloid characteristics and superior electrical conductivity and are a kind of high electrical conductive pseudocapacitive materials. Herein, high electrical conductive cobalt phosphide alloys are fabricated through a liquid phase process and a nanoparticles structure with high surface area is obtained. The highest specific capacitance of 286 F g−1 is reached at a current density of 0.5 A g−1. 63.4% of the specific capacitance is retained when the current density increased 16 times and 98.5% of the specific capacitance is maintained after 5000 cycles. The AC//CoP asymmetric supercapacitor also shows a high energy density (21.3 Wh kg−1) and excellent stability (97.8% of the specific capacitance is retained after 5000 cycles). The study provides a new strategy for the construction of high-performance energy storage materials by enhancing their intrinsic electrical conductivity.

H2O-induced self-propagating synthesis of hierarchical porous carbon: a promising lithium storage material with superior rate capability and ultra-long cycling life

2017 ◽  
Vol 5 (34) ◽  
pp. 18221-18229 ◽  
Author(s):  
Chu Liang ◽  
Sheng Liang ◽  
Yang Xia ◽  
Yun Chen ◽  
Hui Huang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Porous Carbon ◽  
Rate Capability ◽  
Environmentally Benign ◽  
High Yield ◽  
Hierarchical Porous Carbon ◽  
Storage Material ◽  
Lithium Storage ◽  
Hierarchical Porous ◽  
Cycling Life

An environmentally benign and high-yield route is developed to synthesize hierarchical porous carbon for high-density energy storage.

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